Lyons Township is one of thirty townships

Civil township

A civil township is a widely used unit of local government in the United States, subordinate to, and geographic divisions of, a county. Specific responsibilities and the degree of autonomy vary based on each state. Civil townships are distinct from survey townships, but in states that have both,...

 in Cook County

Cook County, Illinois

Cook County is a county in the U.S. state of Illinois, with its county seat in Chicago. It is the second most populous county in the United States after Los Angeles County. The county has 5,194,675 residents, which is 40.5 percent of all Illinois residents. Cook County's population is larger than...

, Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

, USA

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. As of the 2000 census

United States Census, 2000

The Twenty-second United States Census, known as Census 2000 and conducted by the Census Bureau, determined the resident population of the United States on April 1, 2000, to be 281,421,906, an increase of 13.2% over the 248,709,873 persons enumerated during the 1990 Census...

, its population was 109,264. Lyons Township was established in 1850.
According to the United States Census Bureau

United States Census Bureau

The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data...

, Lyons Township covers an area of 36.95 square miles (95.7 km²); of this, 36.38 square miles (94.2 km²) (98.44 percent) is land and 0.57 square miles (1.5 km²) (1.56 percent) is water.

The boundaries of Lyons Township are East: Harlem Avenue, West: the Cook-DuPage County (County Line Road), south: the line of 87th Street, except west of Willow Springs, where it follows the Des Plaines river to the Cook-DuPage County Line, North: the line of 39th Street (Southview Avenue, Brewster Avenue).